package com.tea.room.util;

import java.security.MessageDigest;

/**
 * MD5加密工具类
 * 
 * @author Administrator
 *
 */
public class MD5 {

    public static String sign(String content, String key)
            throws Exception{
        String signStr = content + "&key=" + key;
        return MD5Encode(signStr).toUpperCase();

    }
    
    public static String MD5Encode(String s) {
        char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};       
        try {
            byte[] btInput = s.getBytes();
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            mdInst.update(btInput);
            byte[] md = mdInst.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
       }
    }

}
